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Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Detail) - Dec. 31, 2018
zł in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
PLN (zł)
USD ($)
Disclosure of detailed information about borrowings [line items]      
Guarantees limit ₩ 910,105 zł 23,000 $ 69,346
Performance guarantee [member] | Seoul Guarantee Insurance and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 299,689   1,200
Guarantee for import letters of credit [member] | Industrial Bank of Korea and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit | $     5,980
Guarantee for payment in korean currency [member] | Shinhan Bank and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 5    
Guarantee for payment in foreign currency [member] | KEB Hana Bank and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit   zł 23,000 51,766
Comprehensive credit line [member] | KEB Hana Bank and others [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 40,000    
Comprehensive credit line [member] | KEB Hana Bank [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit | $     10,000
Bid guarantee [member] | KEB Hana Bank [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 58,992   $ 400
Bid guarantee [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 350    
Performance guarantee/Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 376,420    
Performance guarantee/Warrant guarantee [member] | Seoul guarantee insurance [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 996    
Guarantee for advances received/others [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 124,901    
Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 1,037    
Guarantees for licensing [member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 4,070    
Guarantees for public sale [member] | Seoul guarantee insurance [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit 120    
Guarantees for deposits [member] | Seoul guarantee insurance [member]      
Disclosure of detailed information about borrowings [line items]      
Guarantees limit ₩ 3,525